Media Renegotiation

This module describes the Media Renegotiation feature for the enhancement of the media setup process in the Skinny Client Control Protocol (SCCP) telephony control (STC) application (STCAPP) state machine. This feature enables media setup call flows to have improved interworking with third-party call control/Computer Telephony Integration (3PCC/CTI) that control analog endpoints behind IOS gateways.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the “Feature Information for Media Renegotiation” section.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Information About Media Renegotiation

Media Renegotiation

In some customer environments, the media setup messages may arrive in a different sequence and involve a different protocol translation. If the remote side uses a different protocol from that of the calling phone, the media setup message sequence might be different.

Through Media Renegotiation, the media setup process in the STCAPP state machine can be enhanced to support any of the most possible sequences of the media setup messages.

Through this feature, media renegotiation can be introduced in the middle of a call and after early media (before and after the call is connected) is flowing.

The basic concept of the Media Renegotiation design is that no matter which media event is received, the event handler handles only the media direction that belongs to the event. For example, when an event involving the closure of the receiving channel is received, the event handler disconnects the receiving part of the media only, leaving the sending part unaffected in case the media path works both ways.

Additional References

The following sections provide references related to SCCP analog phone support for FXS ports on the Cisco voice gateway.

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Feature Information for Media Renegotiation

Table 1 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Release 15.1(3)T or a later release appear in the table.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

NoteTable 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for Media Renegotiation

Feature Name

Releases

Feature Information

Media Renegotiation

15.1(3)T

Enhances the STCAPP state machine to support any of the most possible sequences of the media setup messages.